Fix test for legacy JS API warning #1581

Job	Run time
Lint spec files	15s
Unit tests	38s
Language \| Dart Sass \| Dart stable	1m 7s
Static analysis	17s
Language \| Dart Sass \| Dart dev	1m 4s
JS API \| Pure JS \| Node lts/* \| ubuntu-latest	1m 22s
JS API \| Pure JS \| Node lts/* \| windows-latest	3m 27s
JS API \| Pure JS \| Browser	1m 19s
JS API \| Pure JS \| Node lts/* \| macos-latest	1m 40s
JS API \| Pure JS \| Node lts/-1 \| ubuntu-latest	1m 27s
JS API \| Embedded \| Node lts/* \| ubuntu-latest	5m 1s
JS API \| Embedded \| Node lts/* \| windows-latest	7m 10s
JS API \| Pure JS \| Node lts/-2 \| ubuntu-latest	1m 22s
JS API \| Embedded \| Node lts/* \| macos-latest	5m 9s
JS API \| Pure JS \| Node lts/-3 \| ubuntu-latest	1m 32s
JS API \| Embedded \| Node lts/-1 \| ubuntu-latest	5m 3s
JS API \| Embedded \| Node lts/-2 \| ubuntu-latest	5m 11s
JS API \| Embedded \| Node lts/-3 \| ubuntu-latest	1m 34s
	44m 38s

Provide feedback